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diff --git a/runtime/contrib/pure_arm_compute/src/internal/nnapi/feature/Utils.h b/runtime/contrib/pure_arm_compute/src/internal/nnapi/feature/Utils.h
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+++ b/runtime/contrib/pure_arm_compute/src/internal/nnapi/feature/Utils.h
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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file Utils.h
+ * @ingroup COM_AI_RUNTIME
+ * @brief This file defines utility functions used in internal::nnapi::feature namespace
+ */
+#ifndef __INTERNAL_NNAPI_FEATURE_UTILS_H__
+#define __INTERNAL_NNAPI_FEATURE_UTILS_H__
+
+#include "misc/feature/Shape.h"
+
+namespace internal
+{
+namespace nnapi
+{
+namespace feature
+{
+
+/**
+ * @brief     Get position of element using channel, row, and column for 3D feature
+ * @param[in] shape Shape of feature
+ * @param[in] ch    Channel index
+ * @param[in] row   Row index
+ * @param[in] col   Column index
+ * @return    Position of element
+ */
+inline uint32_t index_of(const ::nnfw::misc::feature::Shape &shape, uint32_t ch, uint32_t row,
+                         uint32_t col)
+{
+  uint32_t res = 0;
+
+  // NNAPI uses NHWC ordering
+  res += row * shape.W * shape.C;
+  res += col * shape.C;
+  res += ch;
+
+  return res;
+}
+
+/**
+ * @brief     Get position of element using batch, channel, row, and column for 4D feature
+ * @param[in] shape Shape of feature
+ * @param[in] batch Batch index
+ * @param[in] ch    Channel index
+ * @param[in] row   Row index
+ * @param[in] col   Column index
+ * @return    Position of element
+ */
+inline uint32_t index_of(const ::nnfw::misc::feature::Shape &shape, uint32_t batch, uint32_t ch,
+                         uint32_t row, uint32_t col)
+{
+  uint32_t res = 0;
+
+  // NNAPI uses NHWC ordering
+  res += batch * shape.H * shape.W * shape.C;
+  res += row * shape.W * shape.C;
+  res += col * shape.C;
+  res += ch;
+
+  return res;
+}
+
+} // namespace feature
+} // namespace nnapi
+} // namespace internal
+
+#endif // __INTERNAL_NNAPI_FEATURE_UTILS_H__